Overloading operator <<

[bart.kowalski]

Hello,

I'm trying to overload operator << for class CString, which has an
operator const char *. I thought the following code would do:

template <typename T>
inline std::basic_ostr eam<T> operator<<(
const std::basic_ostr eam<T>& p_Stream,
const CString& p_String)
{
p_Stream << static_cast<con st T*>(p_String) << std::flush;
return p_Stream;
}

But instead the operator calls itself recursively ad-infinitum. Can
someone explain why?
Bart.

[Heinz Ozwirk]

<ba***********@ gmail.com> schrieb im Newsbeitrag
news:11******** **************@ g47g2000cwa.goo glegroups.com.. .

Hello,

I'm trying to overload operator << for class CString, which has an
operator const char *. I thought the following code would do:

template <typename T>
inline std::basic_ostr eam<T> operator<<(
const std::basic_ostr eam<T>& p_Stream,
const CString& p_String)
{
p_Stream << static_cast<con st T*>(p_String) << std::flush;
return p_Stream;
}

But instead the operator calls itself recursively ad-infinitum. Can
someone explain why?

I'm surprised that it calls anything at all. It shouldn't even compile:

1. p_Stream is a reference to a constant basic_ostream, but operator<<(char
const*) is not a const member.
2. Your operator<< returns a copy of p_Stream, but basic_ostreams are not
copy constructable.

Which compiler are you using?

Heinz

[bart.kowalski]

>> I'm surprised that it calls anything at all. It shouldn't even compile:

1. p_Stream is a reference to a constant basic_ostream, but
operator<<(char const*) is not a const member.
2. Your operator<< returns a copy of p_Stream, but basic_ostreams are
not copy constructable.

Which compiler are you using?

Oops. That was obviously my mistake, but VC++ 6.0 didn't complain one
bit. It happily called CString's implicit constructor and then operator
<< again.

Thanks.

[ruanh123]

Do you need to add &
at end of inline std::basic_ostr eam<T>
H.

[bart.kowalski]

>> Do you need to add &

at end of inline std::basic_ostr eam<T>

Yes. I need to pass a non const reference and return this reference. It
was a mistake on my part, but the compiler accepted it even though
there's no copy ctor for basic_ostream.